英文字典中文字典51ZiDian.com
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SuperZap {operating system} or {application program} executable {code} in preference to editing the {source code} and recompiling. The SuperZAP program was a quick hack written by one IBM Engineer, possibly from IBM UK, in the late 1960s to directly fix executable files. He needed to fix a bug but it would have taken hours to rebuild the vast {OS/360} executables. The {S/360} architecture has an instruction ZAP (Zero and Add Packed) for {packed decmial} arithmetic, that sets the byte at a given address to a given value. Superzap used this to write data given as a string of hex digits to a given location in an executable file in a matter of seconds. Soon the IBM development labs were releasing all Programming Temporary Fixes (PTFs) to OS/360 in this form. OS/360 included a version called IMASPZAP or AMASPZAP which persisted through {MVS}, {MVS/SP}, {MVS/XA}, {OS/390} and probably still remains in {z/OS}, the distant descendent of OS/360. [Private 2004-02-05 e-mail from Chris Gage, IBM employee and SuperZap user, 1970-]. (2007-03-15)
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